topic Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7) in Disk Enclosures

Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Pesmerga1 — Tue, 23 Jul 2013 07:56:09 GMT

Hello.

I'm newbie on this forum and need your help.

I work with P410i controller but don't understand the difference between the Array Accelerator on the logical device and the Drive Write cache on the Controller.

Can I use Accelerator without drive write cache ?

Someone can help me ?

Thanks for your help.

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Torsten. — Tue, 23 Jul 2013 10:48:48 GMT

The cache memory module of the smartarray controller is also known as Array Accelerator.

Some features are available only with the module installed, see

http://h18004.www1.hp.com/products/quickspecs/productbulletin.html#spectype=worldwide&type=html&docid=13201

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Pesmerga1 — Tue, 23 Jul 2013 11:38:39 GMT

Thanks for your response.

Can you confirm me if the option "array accelerator" works alone. Must I active the option "Drive Write Cache" to use the array accelerator ?

I understood the "Drive Write Cache" is the physical drive cache and not the controller cache and the array accelerator is the controller cache. Correct me if I'm wrong ?

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Torsten. — Tue, 23 Jul 2013 11:45:47 GMT

Please read this:

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02278484/c02278484.pdf

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Pesmerga1 — Tue, 23 Jul 2013 12:26:39 GMT

Thanks a lot.

So, this white paper confirm my understanding, the "Drive write cache" is the physical drive cache and the array accelerator is the controller cache.

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Torsten. — Tue, 23 Jul 2013 12:31:36 GMT

The first question was not really clear. As you know now, you can enable the cache on the disk drives itself, but this cache is NOT protected!

Re: Array accelerator vs Drive Write Cache on P410i (DL580 G7)

Pesmerga1 — Tue, 23 Jul 2013 13:06:35 GMT

In the facts, I don't want to active the drive write cache.

I lost a battery on my controller few days ago. After replace and charge the Array accelerator board, I suspect the server don't use the cache (low performance), so I tried to understand if the drive write cache is not implicated.